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External flooding events generate debris such as shipping containers, wood logs, and vehicles. Impact force exerted on structures in the inundation zone by such debris might result in severe structural damage of structure. Thus, we carried out full-scale air-borne and flood-borne vehicle impact experiments and prove the applicability of theoretical equation in which the impact force is estimated. Moreover, by analyzing US NHTSA's experimental data, a list of stiffness for various types of vehicle was constructed, which is important in predicting the flood-borne vehicle impact force.